In Sarah's Dreams, Level 3. Readers

Elementary to Upper Intermediate Sarah Gregson hasn't made any friends at her new school. And Jill Cleary, the school bully, is making her life miserable. But when Sarah goes to sleep at night, she has a strange friend who comes into her dreams and shows her how things might be different. It's okay while these things only happen in her dreams, but soon it becomes clear that Sarah's world is changing in a very unusual and rather scary way